netdev - Re: [IPSEC]: Avoid undefined shift operation when testing algorithm ID

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Message-Id: <20071219.234455.79622323.davem@davemloft.net>
Date:	Wed, 19 Dec 2007 23:44:55 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	herbert@...dor.apana.org.au
Cc:	netdev@...r.kernel.org
Subject: Re: [IPSEC]: Avoid undefined shift operation when testing
 algorithm ID

From: Herbert Xu <herbert@...dor.apana.org.au>
Date: Thu, 20 Dec 2007 12:29:37 +0800

> [IPSEC]: Avoid undefined shift operation when testing algorithm ID
> 
> The aalgos/ealgos fields are only 32 bits wide.  However, af_key tries
> to test them with the expression 1 << id where id can be as large as
> 253.  This produces different behaviour on different architectures.
> 
> The following patch explicitly checks whether ID is greater than 31
> and fails the check if that's the case.
> 
> We cannot easily extend the mask to be longer than 32 bits due to
> exposure to user-space.  Besides, this whole interface is obsolete
> anyway in favour of the xfrm_user interface which doesn't use this
> bit mask in templates (well not within the kernel anyway).
> 
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Thanks for fixing this bug, patch applied!
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